核心数据保存错误（NSValidationErrorKey，Cocoa错误1570）保存NSDate [英] Core Data Save Error (NSValidationErrorKey, Cocoa error 1570) saving NSDate

问题描述

我在Xcode中保存到Core数据对象时出错。

I'm getting an error with saving to a Core data object in Xcode.

Xcode说错误在NSDate变量datum几乎试过一切。
错误是：

Xcode says that the error is in the NSDate variable 'datum' but I have tried almost everything. Error is:

2011-07-12 18:01:29.068 WeekLijstje[3205:207] Core Data Save Error
NSValidationErrorKey    datum
NSValidationErrorPredicate  (null)

NSValidationErrorObject
<DagLijst: 0x6e2fcd0> (entity: DagLijst; id: 0x6e2fd30 <x-coredata:///DagLijst/t99F423FC-AAE9-4692-9264-EF0FF7A020572> ; data: {
    Voedsel = nil;
    datum = nil;
    hoeveelheid = 0;
    punten = 0;
})
NSLocalizedDescription:The operation couldn’t be completed. (Cocoa error 1570.)

一个小代码snipet：

A small code snipet:

        DagLijst *newDaglijst = [NSEntityDescription insertNewObjectForEntityForName:@"DagLijst" inManagedObjectContext:self.managedObjectContext];

        NSDate *selDatum = [NSDate date];
        newDaglijst.punten = [NSNumber numberWithInteger:10];
        newDaglijst.hoeveelheid = [NSNumber numberWithInt:100];
        newDaglijst.Voedsel = geselecteerdVoedsel;
        newDaglijst.datum = selDatum;
        NSError *error = nil;
        if (![newDaglijst.managedObjectContext save:&error]) {
...

也是DagLijst对象的类：

Also the class of the DagLijst object:

@interface DagLijst : NSManagedObject {
@private
}
@property (nonatomic, retain) NSDate * datum;
@property (nonatomic, retain) NSNumber * punten;
@property (nonatomic, retain) NSNumber * hoeveelheid;
@property (nonatomic, retain) Voedsel *Voedsel;

@end

所以你可以看到我把一个NSDate放入'datum'变量。但在执行我仍然得到一个错误。

So you can see that I put an NSDate into the 'datum' variable. But on execution I still get an error.

我搜索并尝试了很多事情。
希望我有一个清楚的问题。

I have searched and tried many things. Hope i'm a bit clear about the problem. Please can someone help me (sorry for the bad English).

推荐答案

可可错误 1570 表示不填写必填字段。
在这种情况下，您有两个属性 nil ： Voedsel 和 datum 。

The cocoa error 1570 means that mandatory fields are not filled in. In this case, your have two attribues that are nil : Voedsel and datum.

p>

I see in your code :

newDaglijst.Voedsel = geselecteerdVoedsel;
newDaglijst.datum = selDatum;

检查 geselecteerdVoedsel 和 selDatum 不为零，或者它们被过度使用，并且完成为零。
如果它们是可选数据（但我不这么认为），请在coredata中将它们定义为可选。

Check that geselecteerdVoedsel and selDatum are not nil or that they are overreleased and finish to be nil. If they are optional data (but I don't think so), define them as optional in coredata.

希望有帮助，

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